725, 730, 735, 740 and 740 EJECTOR Articulated Trucks Power Train Electronic Control System Caterpillar

Illustration 1	g00756754
Schematic of the CAT Data Link Circuit

This diagnostic code is recorded when the ECM reads a diagnostic code that is internal to the ECM.

The possible causes of this diagnostic code are listed:

• The engine ECM has failed. There are no serviceable parts within the engine ECM.

• Cat Data Link has failed.

Note: Ensure that the diagnostic code for the Engine ECM is active.

Test Step 1. VERIFY THAT THE DIAGNOSTIC CODE IS PRESENT.

1. Turn the key start switch and the disconnect switch to the OFF position.

2. Remove connectors J1 and J2 from the ECM and reconnect connectors J1 and J2to the ECM.

3. Turn the key start switch and the disconnect switch to the ON position.

4. Enter the service mode of the Caterpillar Monitoring System and clear all inactive diagnostic codes.

5. Operate the machine.

6. Check whether CID 0590 FMI 09 is present.

Expected Result:

The CID 0590 FMI 09 is NOT present.

Results:

• OK - The diagnostic code is NOT present. Resume normal machine operation. Stop.

• NOT OK - The diagnostic code remains present.

  Repair: Exit this procedure and perform this procedure again. If the problem remains, perform CID 0248 FMI 09. See Troubleshooting, "MID 027 - CID 0248 - FMI 09 " .

  Stop.